PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING最新文献_第4页

Cause Analysis of Rail Corrugation Based on Stick-slip Characteristics 基于粘滑特性的钢轨波纹原因分析

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2023-01-16 DOI: 10.3311/ppme.21159

Zhiqiang Wang, Z. Lei

{"title":"Cause Analysis of Rail Corrugation Based on Stick-slip Characteristics","authors":"Zhiqiang Wang, Z. Lei","doi":"10.3311/ppme.21159","DOIUrl":"https://doi.org/10.3311/ppme.21159","url":null,"abstract":"By analyzing the measured corrugation data, the cause of rail corrugation was discussed theoretically. Then, the vehicle-track coupling model was used to study the stick-slip characteristics of wheel-rail system. Finally, the cause of rail corrugation was explained by combining modal analysis and wheel-rail stick-slip relation. The transverse stick-slip curve on the inner rail-inner wheel of the leading wheelset presents a negative slope characteristic, which makes the inner wheel easy to slide on the inner rail surface and aggravates the wear of inner rail; there are also negative slope sections of the stick-slip curve on the outer rail-outer wheel of the trailing wheelset, but the adhesion coefficient is relatively large, indicating that the outer wheel will not slide obviously and the wear is relatively small. Meantime, with the increase of line curve radius, the negative slope phenomenon of stick-slip curves on the inner and outer rail sides shows a decreasing trend, which illustrates that the sliding wear of wheel is gradually reduced, and thus the occurrence probability of rail corrugation decreases. Combined with modal analysis, it can be seen that the coupling action of wheel discs bending vibration and inner rail bending-torsional vibration is the main cause of rail corrugation under the condition of wheel-rail system with stick-slip negative slope.","PeriodicalId":43630,"journal":{"name":"PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90869941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Numerical and Experimental Study of the Use of Mineral Pumice in the Core of the Sandwich Panel to Absorb the Shock Wave 利用矿物浮石在夹层板芯处吸收激波的数值与实验研究

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2023-01-09 DOI: 10.3311/ppme.19341

Mahmoud Kaffash Mirzarahimi, H. Khodarahmi, M. Ziashamami, R. Hosseini

{"title":"Numerical and Experimental Study of the Use of Mineral Pumice in the Core of the Sandwich Panel to Absorb the Shock Wave","authors":"Mahmoud Kaffash Mirzarahimi, H. Khodarahmi, M. Ziashamami, R. Hosseini","doi":"10.3311/ppme.19341","DOIUrl":"https://doi.org/10.3311/ppme.19341","url":null,"abstract":"Reducing the effects of unwanted shocks and waves is a very common problem in engineering. Some materials, due to their inherent properties, can be used as energy absorbers, such as foams, porous materials, and granular materials. porous granular materials that were considered in this study due to their low density and energy absorption capacity. But to use the granular material as the core of the sandwich panel, you have to think of a way to hold the granules together. In this article, using molding with resin, aluminum and polyurethane foam, an attempt has been made to make cores for sandwich panels from mineral pumice. the use of foam showed better performance than the other two materials. These adsorbents have the property of substrate flexibility and impact absorption and low density of porous materials at the same time. The properties of the core were obtained using a pressure test and used in software. Explosion experiments are free and Abaqus software is used in the simulation. The results show that the panel with a thicker back cover has a better performance in absorbing explosion energy. Increasing the thickness of the core has also increased energy absorption.","PeriodicalId":43630,"journal":{"name":"PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88539590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-objective Optimization of Multi-cells Foam Mattress 多孔泡沫床垫的多目标优化

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-12-22 DOI: 10.3311/ppme.20259

A. Benkhettou, A. Sahli, S. Benbarek, Ismail Boudjemaa

{"title":"Multi-objective Optimization of Multi-cells Foam Mattress","authors":"A. Benkhettou, A. Sahli, S. Benbarek, Ismail Boudjemaa","doi":"10.3311/ppme.20259","DOIUrl":"https://doi.org/10.3311/ppme.20259","url":null,"abstract":"Body pressure dispersion mattresses are useful tools for preventing pressure ulcers in patients with limited mobility who experience prolonged body weight-related compression loads at their body contact areas over time. The objective of this study is to propose and optimize a multicell finite element (FE) model of foam mattress to prevent patients from developing pressure ulcers (bed sores), by improving the contact pressure distribution on the upper mattress surface and immersion in the mattress. The NSGA-II multi-objective genetic algorithm was used to predict different configurations of cell materials to provide a more comfortable sleep. Our mattress model contains many cells (50 × 50 × 50), each of which can contain one of the nine different foam firmnesses. The NSGA-II algorithm attempts to combine the properties of soft and firm foams into a single mattress. however, the complexity and intersection of the fitness function objectives and the high number of possible chances forced the optimal solutions set to extend into the area under the result of foams that have a compressive strength between soft and firm. Based on the overall optimization results, the standard deviation ranged from 0.00325 to 0.00175 MPa and the maximum mattress immersion ranged from 50 mm to less than 20 mm. Mattresses with optimal configurations disperse body pressure smoothly to fit the patient's body shape.","PeriodicalId":43630,"journal":{"name":"PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74259697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting the Impact of Product Type Changes on Overall Equipment Effectiveness Through Machine Learning 通过机器学习预测产品类型变化对整体设备效率的影响

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-12-19 DOI: 10.3311/ppme.21320

Péter Dobra, J. Jósvai

引用次数: 0

Comparative Study to Optimize Surface Roughness of the Titanium Alloy Ti-6Al-4V by Applying Taguchi, RSM and TLBO Methods 应用田口法、RSM法和TLBO法优化Ti-6Al-4V钛合金表面粗糙度的比较研究

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-12-09 DOI: 10.3311/ppme.17911

Younes Belbellaa, N. Kribes, M. Yallese, Habiba Lekmine, S. Boutabba, A. Bezazi

{"title":"Comparative Study to Optimize Surface Roughness of the Titanium Alloy Ti-6Al-4V by Applying Taguchi, RSM and TLBO Methods","authors":"Younes Belbellaa, N. Kribes, M. Yallese, Habiba Lekmine, S. Boutabba, A. Bezazi","doi":"10.3311/ppme.17911","DOIUrl":"https://doi.org/10.3311/ppme.17911","url":null,"abstract":"Titanium alloys are used in aeronautics and the shipbuilding industry for their good intrinsic properties, namely low density (40% less than steel), very good mechanical properties and resistance to corrosion. The purpose of this study is to optimize the cutting conditions during the turning of Ti-6Al-4V titanium alloy with Minimum of Quantity of Lubrication (MQL) conditions leading to minimize the surface roughness (Ra). The tests were carried out according to a Taguchi L18 design plan by varying four input factors namely: the cutting speed, the feed rate, the depth of cut and the cutting tool material (coated carbide with (PVD) (GC1125) and uncoated carbide (H13A)). Analysis of variance (ANOVA) was used to found the contribution of each factor and to determine which parameters had a significant influence on the surface roughness. The treatment of the results made it possible to propose a mathematical model, which allows predicting Ra. In addition, Taguchi Signal/Noise (S/N) analysis was used in order to optimize the cutting conditions permitting to minimize Ra. The Desirability Function (DF) was also determined. In addition, the obtained results were compared to the one determined using Response Surface Methodology (RSM) and Teaching and Learning Based Optimization (TLBO). It is important to note that the TLBO method gave a very satisfactory result.","PeriodicalId":43630,"journal":{"name":"PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82891340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Surface Hardness Modification of Selective Laser Melted Ti6Al4V Parts by Sliding Friction Diamond Burnishing 选择性激光熔化Ti6Al4V零件表面硬度的滑动摩擦金刚石抛光

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-11-22 DOI: 10.3311/ppme.21124

G. Dezső, F. Szigeti, G. Varga

{"title":"Surface Hardness Modification of Selective Laser Melted Ti6Al4V Parts by Sliding Friction Diamond Burnishing","authors":"G. Dezső, F. Szigeti, G. Varga","doi":"10.3311/ppme.21124","DOIUrl":"https://doi.org/10.3311/ppme.21124","url":null,"abstract":"Selective laser melting (SLM) is a frequently used additive manufacturing technology for creating metallic, especially Ti6Al4V parts. After the production by SLM usually postprocessing is necessary for several reasons. Here the sliding friction diamond burnishing is applied as postprocessing procedure.In this paper an experimental study of surface hardness improvement of selective laser melted Ti6Al4V ELI cylindrical parts is demonstrated. The surface is modified by sliding friction diamond burnishing as postprocessing machining. The design of experiment method was applied to investigate effect of five factors (two SLM and three machining parameters) on surface hardness modification.It is shown that both SLM and postprocessing factors makes significant effect to the surface hardness improvement, most important ones are laser power, laser scan speed during manufacturing, and the burnishing force as factor of postprocessing. Empirical formulas are fit to measurement data, and visualized by surface plots. Relationship between factors and the surface hardness improvement is strongly nonlinear. In the investigated parameter window burnishing force has always positive effect to surface hardness improvement.Electron microscopic investigations show that change in surface hardness can be related to four main morphological changes: compression of the surface by plastic deformation of protrusions, attenuation of valleys, formation of inner cavities and creation of small protrusions by diamond tool. This paper is an extended paper of a conference paper published in the proceedings book of the XXXI. International Welding Conference (Kecskemét, Hungary).","PeriodicalId":43630,"journal":{"name":"PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88556417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Isolation Valve Placement Optimization of Water Distribution Networks to Reduce Vulnerability 配水网络隔离阀布置优化以降低脆弱性

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-11-04 DOI: 10.3311/ppme.20694

Richárd Wéber, Tamás Huzsvár, C.-S. Hős

{"title":"Isolation Valve Placement Optimization of Water Distribution Networks to Reduce Vulnerability","authors":"Richárd Wéber, Tamás Huzsvár, C.-S. Hős","doi":"10.3311/ppme.20694","DOIUrl":"https://doi.org/10.3311/ppme.20694","url":null,"abstract":"Due to the growing pace of urbanization and the rapid expansion of the population, the utilities nowadays are facing a more challenging task than ever before, to maintain the functionality of their massive Water Distribution Networks. In this paper, three different techniques are presented for the maximization of network robustness against random pipe-bursts. This paper analyses the vulnerability of segments of WDNs from the viewpoint of the consumers that is the product of the failure rate and the relative demand loss. Topological parameters could approximate the vulnerability. During the investigation, 27 real-life WDNs were analyzed from the region of Western Hungary. In two networks, a complete isolation valve replacement optimization is presented using these low-cost topological parameters as fitness functions. It is proved that by rearranging the isolation valves of the WDN, using a standard genetic algorithm and a fast-evaluated fitness function, the nature of the vulnerability distribution can be changed to a more favorable one. This means that it is possible to increase the robustness of a WDN even without using a calibrated hydraulic model; since these topological parameters can be extracted from simple databases.","PeriodicalId":43630,"journal":{"name":"PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80378188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Axisymmetric Stress State of Adhesive Joint of a Circular Patch with a Plate Weakened by a Circular Cut-out 圆形切口削弱板与圆形贴片粘合接头轴对称应力状态

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-10-27 DOI: 10.3311/ppme.18801

S. Kurennov, N. Smetankina, K. Barakhov

引用次数: 1

Efficiency of Parallel Connected Desuperheater in a Cooling Circuit 并联减温器在冷却回路中的效率

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-10-27 DOI: 10.3311/ppme.20262

M. Formánek, P. Horák

引用次数: 0

Multi-attribute Optimization of Weld Parameters for Micro-friction Stir Welded Al6061/SS304 Sheets Using TOPSIS Approach 基于TOPSIS法的Al6061/SS304微摩擦搅拌焊接焊缝参数多属性优化

IF 1.3

PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING Pub Date : 2022-10-13 DOI: 10.3311/ppme.17766

M. S. Srujan Manohar, Karunanithi Mahadevan

引用次数: 3